Safety-valve stem.



` c. w'. iso. sAFErvmvE STEM. l I APPucATmN'ULEn myn. |914. 1,259,745. `Patented Mar. 19.19111 l li/ L a Je 4 Wrfnesses;

UNITED STATES PATENT OFFICE.

saFETY-VALVE STEM.

Specication of Letters Patent.

Patented Mar. 19, 1918.

Application led February 21, 1914. Serial No. 820,118.

T 0 all lwhom it may concern.'

Be it known that I CHARLES W. loo, a citizen of the United gtates, residing at 831 East Boulder street, in the city of Colorado Springs, county of El Paso, and State of Colorado, have invented a new and useful;- Safety-Valve Stem, of which the following is a specification.

My invention relates to improvements in valve stems and safety valves and annunciators in one combinatlon for pneumatic appliances, and more especially applicable to use on pneumatic tires for vehicles; and the objects of my improvements are to provide means for designating the pressure of a1r within the pneumatic appliance-at any time, to provide a safety valve to release the compressed air when lan excessive orundesred pressure occurs` from any cause, and to provide an electric annunciator to designate an excessive or undesired low ressure within .the tire or other 'pneumatlc a pliance-.on

-some.convenient view point to. t e operator.

Izattain'these objects byA thermechanjsm illustrated in the accompanying drawing.

. .Figure 1. is aside elevation of the ,sa ety valve mounted upon the valve-stem of a pneumatic tire for. automobiles.

v, 2. is adetail on an exaggerated scale of a' side elevation of the piston' and the graduated scale of the safety valve.

Fig. 3. is a detail on an exaggerr-.te'd scale of a side elevation of part o the safet valve above the line A B on' Fig. 1, wit parts removed to disclose the arts beneath, and se egated to shorten the dures.

Simlar letters and figures rei-er to similar parts throughout the veral views.

The piston 6, operated by air ressuro from the pneumatic tire 1, the cylmder 5, the piston 6, ca g the safety valve 8, and having a gra' uated scale 17, the glass casing 13, containing the contacts 26, and 27, and the intake valve stem 19, constitute the principal parts of my invention.

The illustration in the accompanying drawings shows my invention attached by threaded connection to the valve stem 3, of the pneumatic tire by means of a etal connectmg thimble 4 carrying inteal herewith the intake .valve stem 19, pro de with the casing or cap 20, carrying a common intake valve as for instance the Schrader valve. Mounted by threaded connection with the said metal connectin thimble 4, is the metal cylinder 5, in whic is operated the pneumatic piston 6, mounted upon the hollow piston rod 7 whlch is forced inward toward the pneumatic tire by means-of the expansion of the coil spring 10,-working against the threaded compression nut 11, within the cylinder 5. The piston 6, is forced outwardly against the spring 10, by the pressure of the air within the pneumatic tire 1. The outer end of the hollow piston rod 7, carries a safety valve 8, havlng a plunger pin 9, pro'ectingfrom the end of the piston rod 7, an adapted to engage the bumper 2l, on the inside of the top end of the glass .casing 13, covering the valve 8, and the graduated scale 17, of the 'hollow piston rod 7.

In the operation of this.k appliance the valve stem 3, of a common. automobile tire is stripped of its valve and upon it is placed the lock nut 24, to revent the valve stem tl,-l

from cha-ling on t e rim 2, of the wheel. Then the lock nut :23, is also laced-upon the valve lstem 3, by threadeI connection and is used to hold the metal thnnble f4, from torsional movement upon the valve' stein -3.

The metal thixnble 4, is then screwed down upon the valvestem', and carries with'it in adjustable threaded connection 'the other parts of my appliance. The air is' forced into the tire 1, through the intake'valve" stem 19, and as the pressure --inereases the air will force the pneumatic piston 6, 'outward against the coil spring 10, which vwill yield to thc pressure allowing the'hollow piston rod 7, to be forced upwardly and outwardly from the base o f the valve stemif, exposing the graduated scale of said iston ro 7, so that it may be seen throng the glass casing 13, above the metal band '12, which secures said glass casing tof'the ad-A justable thimble 25. As the' pressure increases from any cause the said piston 4rod 7, will be forced outward and upward 'carry ing with it at its outer end the safety'valve 8, rigidly secured to the plunger pin 9, projecting beyond said piston rod until the end of the plunger pin 9, is carried against the bumper 21, on the inside of the outer end of the glass casing 13,i when a continuation of the pressure will carry the piston 6, so as to force the valve seat 15, away from the valve 8, thus releasing the confined air from the tire 1, through the valve stem 3, and up through the hollow pist-on rod 7, and out into the cavity of the glass casin 13, and out through the air holes 14, le, o the glass pressure. The scale here shown in Fig. 32,1'

is marked for a pressure of from 10 pounds to 110 pounds and iis indicated by the iigures being disclosed above the 'metal band 12, and can be seen' thiough the `glass casing 13. The safety lvalve is useful also among other emergencies in preventing the bursting ofV a tire from any excessive acquired pressure and especially from over-iniution, from over-heating while standing in the sun orv over-heating when, running the tirc for a long time at a high speed, as in road racing, in each Aof which cases the pressure would carr the plunger 9, against.

the bumper 21, an relieve. the excessive pressure by letting out some ofthe airrso as to save the burstin inthe'tire might becomeA excessively -de- 4f1ated, \.allowing the pressure togo down to 3() pounds or 20poud's which would allow the circular contact ring 26, encircling, in `adjustable connection, the hollow iston rod 7 v,Lto .come down linto contact wit `the contactend 28, of the electrode 27, held in insulated connectionfin the side of the glass' casing 13, and thusV making a short circuit with avbattery and an annunciator mounted upon the dash or other prominent part of the automobile in plain view of the operator, warning him of thedeliated condition. 24,is a lock nut securin the valve stem 3, on the wheel rirn 2, an 22, is a lock nut provided to prevent 'torsionaljaction'between the cylinder `5,-and the adjusting thimble 25.L 23, is a lock nut provided toy prevent torsional action between the valve stem 3 andthe thimble 4. 18, is a lock nut provided to dprevent torsional action between the cylin er 5, and the thimble 4.-. The pressure of `the coil spring 10, is regulated by means of the adjustment by screw connection of the compression nut 11, upon the inside of the cylinder V5, while the pressure of the valve spring 16, is adjusted by means of the valve seat 15, being 'moved by the adjustable threaded connection .with the inside of the hollow piston rod 7 The lower end or the inner end of the plunger pin 9, Works loosely in a guide hole in the spring seat 32, on the inside of the hollow valve piston rod 7 of the' tire'r. An-f other feature ofthe sa ety valve is mvpro'- Ariding a safeguard from rim cuttingwhere- To adjust the gradiiated scale 17, the glass casing 13, is adjusted upon the cylinder 5, by means of threaded connection with the inside of the adjusting thimble 25, and secured from change by means of the lock nut. 22.

To secure an air tight contact between the piston 6, and the inside of the cylinder 5, the piston is provided with gaskets 30, 30,

as shown in Fig. 2, and Fi 3. The contact 31, is provi ed at its contact end with thin spring contact 29 connecting with yielding contact with the outside of the hollow piston rod Claims: '.l f,

, 1. Ina neum'atic valve structure of the class described, for thereceptacles of pneumatic appliances, va thimble in threaded connection with the valve stem of the appliance said valve stem having the valve removed, a valve'stem and intake valve laterally extending from the side of said thimble, a cylinder-in threaded connection with said thimble, a pneumatic piston in said cylinder having a hollow piston rod integral therewith extending beyond said cylinder and'having graduated pressure numfbers marked thereon toindieate the pneumatic pressure within the appliance, a glass extension to'said cylinder secured thereto adjustably. by threaded connection, a' pressure valve 'in the end of said hollow piston rod havin a plunger rod extending'be ond the end o the hollow piston rod an integral with said pressure valve, a bumper in said gl'assextension adapted to engage said plunger rod to release said pressure valve when said hollow piston rod is forced outwardly bythe pneumatic pressure within thea pliance', substantially as set forth and for t e purposes specified.

2. A combinedY -pneumatic' safety tire Valve', pressure indicator and electric annunciator, comprisin a thimble in threaded connection with t e valve stem of a pneumatic tire with the valve removed, a pneumatic cylinder' in threaded connection with said tlnmble, an'intake valve and stem extending integral and4 laterally with said thimble,a pneumaticiston within said cylinder adaptedrto be orced from the appliance bythe pneumatic pressure within and having 'a pressure spring to force it against the pneumatic pressure with adjustable force, a hollow piston rod extending through. and integral with said piston,

a tubular glass extension connected adjustably4 by threaded contact to said cyl-V inder and carrying two electric contacts on its side and a bumper at its end, a pressure check valve in the end of thehollow piston rod adapted to prevent the air from escaping through the rod, a plunger in integral with the check valve and extending beyond the piston rod and registering so rod, a coil spring adapte-d to hol as to engage said bumper and adapted to release said check valve and the air within the appliance, a pressure springadapted to close said l'check valve when the ressure from said bumperis removed, a iding electric contact betwe'efn .one of the insulated electric contacts and",th e side of the said hollow piston rod, arielectric contact nearer the end of the hollow piston rod registering to come into contact with theother insulated electric Contact when the pneumatic pressure is removed to a certain pressure and adapted to form a short circuit in connection with an annunciator, all substantially as set forth and for the purposes specified.

5. In la valve structure of the class described, the combination of a valve stem of a pneumatic appliance with the valve removed therefrom, a tubular member connected therewith by threaded connection and having an intake valve connected laterally thereto adapted to sup ly air to the appl1aiice,ja cylinder connected) adjustably to said tubuvlar membeig-, a pneumatic piston working within said cylinder and forced from said valve stem and said appliance by pneumatic pressure and having a coil pressure spring adjustably secured near the outer end of sai cylinder on the inside thereof adapted to force said piston toward said valve stein and said appliance, a hollow piston rod extending through said piston and integral therewith and adapted to release air from said cylinder, a check valve in the outer end of said piston rod adapted to prevent the air from escaping while closed and liaving a plunger pin integral therewith protruding be ond the end of said hollow piston rod and a apted to be forced against aI bumper by the neumatic pressure on said piston and to reease said check valve thereby, a tubular glass case extension of said cylinder secured to said cylinder by adjustable threaded connection and having a bumper in its end registering with said plunger and adapted to to force it back within said hollow iston said check valve in position against its valve seat while not opened by said plunger pin, graduated scale numbers on said hollow piston rod adapted to indicate the air pressure within the cylinder and within the appliance, two electrical connections in the side of said glas case adapted to connect to two electric contacts on the inside with said hollow piston rod and on the outside of tlie glass case to connect with an electrically operated annunciator on some desirable fixture, one of said connections having a pliable electric contact slidably connected with the side of said hollow piston rod and said piston rod having a projectin metal electric contact near itsv endf a apted to engage the other of the said two electrical connections while the pressure from within the appliance is reduced below normal and to thus c use a short circuit of the electrical' current adapted to operate said annunciator, all im combination with a pneumatic tire or pneumatic appliance, substantially as set forth and for the purposes specified.

4.' In a safety valve for pneumatic appliances, the combination with a pneumatic tire or other pneumatic appliance, of a valve stem having a longitudinal extension and a side intake valve between the extension and the pneumatic appliance, said extension comprising `a c linder, a' pneumatic piston carrying a gra uated hollow piston rod, a

release lvalve plunger at the end of said hollow piston rod and means for opening said plunger when a certain pressure is attained, a glass housing having orices and covering thel end of said hollow piston rod, an electric terminal in said housing and an electric contact on said hollow pistonrod adapted to engage said terminal on its side toward the end of-said piston rod, all substantially set forth and for the purpose specified.

CHARLES W. 1GO.

Witnesses:

MARGARET M. PLAT'r, R. B. VAN WINKLE.

copies of this patent may`be obtained for ve cents each, by addressing the "Commissioner e! Patents.

Washington, D. 0. 

